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React encapsulates the example code of a Portal reusable component

小云云Original: 2018-01-03 09:31:432320browse

One of the cores of react is components. This article mainly introduces you to the relevant information about encapsulating a Portal reusable component in the React tutorial. The article introduces it in detail through sample code. Friends who need it can refer to it. The following is Come and learn with me.

Introduction to Portal

So we need a general component that does the following things:

can be written declaratively in a In the component
does not actually render where it is declared
supports transition animation

Then, components such as modal, tooltip, notification, etc. can be based on this component. We call this component Portal.

If you are using React16+, you must at least know something about Portal or be proficient in using it.

Portal can create a DOM outside of your root element.

1. Usually your website only has one root

<body>
 <p id="root"></p>
</body>

2. After using Portal, it can become as follows

<body>
 <p id="root"></p>
 <p id="portal"></p>
</body>

Portal high-order component encapsulation

The demo of Portal can be seen on the official website, and what we want to achieve is to encapsulate it into a reusable component.

Goal

You don’t need to manually add HTML under the body, you can create it yourself through the component.

<CreatePortal
 id, //可以传入id
 className, //可以传入className
 style //可以传入style
 >
 此处插入p或者react组件
</CreatePortal>

Implementation plan

1. Create a createPortal function, which will return a Portal component

function createPortal() {

}
export default createPortal()

2. Create a Portal component

import React from 'react'
import ReactDOM from 'react-dom'
import PropTypes from 'prop-types'
function createPortal() {
 class Portal extends React.Component{
 }
 return Portal
}
export default createPortal()

3 , render function implementation, use createPortal to create portal.

render() {
 return ReactDOM.createPortal(
  this.props.children,
  this.el
 )
}

4. Implementation of componentDidMount function, add dom to the body

componentDidMount() {
 document.body.appendChild(this.el);
}

5. Implementation of componentWillUnmount function, clear DOM structure

componentWillUnmount() {
   document.body.removeChild(this.el)
  }

6. Implementation of props, including id, className, style

constructor(props) {
 super(props)
 this.el = document.createElement('p')
 if (!!props) {
  this.el.id = props.id || false
  if (props.className) this.el.className = props.className
  if (props.style) {
   Object.keys(props.style).map((v) => {
    this.el.style[v] = props.style[v]
   })
  }
  document.body.appendChild(this.el)
 }
}

7, complete code

import React from 'react'
import ReactDOM from 'react-dom'
import PropTypes from 'prop-types'
function createPortal() {
 class Portal extends React.Component{
  constructor(props) {
   super(props)
   this.el = document.createElement('p')
   if (!!props) {
    this.el.id = props.id || false
    if (props.className) this.el.className = props.className
    if (props.style) {
     Object.keys(props.style).map((v) => {
      this.el.style[v] = props.style[v]
     })
    }
    document.body.appendChild(this.el)
   }
  }
  componentDidMount() {
   document.body.appendChild(this.el);
  }
  componentWillUnmount() {
   document.body.removeChild(this.el)
  }
  render() {
   return ReactDOM.createPortal(
    this.props.children,
    this.el
   )
  }
 }
 Portal.propTypes = {
  style: PropTypes.object
 }
 return Portal
}
export default createPortal()

Summary

createPortal and Provide have similar implementation ideas, using functional programming ideas to achieve the goal. If you think this thing is useful, go ahead and use it.

Related recommendations:

Overview of Oracle Portal and its portal development

Liferay study notes (1) Liferay Portal5.2.3 environment Initial setup

Oracle Fusion Middleware Ⅱ: Weblogic, UCM, WebCenter Portal

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